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  1. IBM released its first PC in 1981. Can you name the operating system which was most popular at that time?

    2. A.

     MS-DOS
    B.

     PC-DOS
    C.

     OS/360
    D.

     CP/M
    E.

     None of the above

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    Answer : Option D

    Explanation :

    CP/M, originally standing for Control Program/Monitor and later Control Program for Microcomputers, is a mass-market operating system created for Intel 8080/85-based microcomputers by Gary Kildall of Digital Research, Inc. Initially confined to single-tasking on 8-bit processors and no more than 64 kilobytes of memory, later versions of CP/M added multi-user variations and were migrated to 16-bit processors. CP/M was displaced by DOS soon after the 1981 introduction of the IBM PC.

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